chemistry
a mixture of O2 and gas "Y" (mol wt. 80) in the mole ratio a:b has a mean molecular weight 40.. what would be mean molecular weight,if the gases are mixed in the ratio b:a under identical conditions? (gases are non reacting)Sunday, May 15, 2016 by kasturi

chemistry
assuming the volume of h2so4 needed to completely neutralize naoh of concentration 0.2m is 23.50ml take the volume of base to be 2ml question write a balance equation for the neutralization calculate the concentration of the acid what indicator can be used for the analysis and...Sunday, May 15, 2016 by chiemelie

chemistry
The local weather forecaster reports that the current barometric pressure is 29.5 inches of mercury. What is the current pressure in atmospheres? 9.99 atm 3.93 atm 0.986 atm 883 atm 1.00 atmSunday, May 15, 2016 by Ha

Chemistry
If 845mL of a 2.5x10^-5 mol/L solution of Ni(NO3)2 was mixed with 195mL of a 4.86x10^-2 mol/L solution of KOH, would precipitate form? Calculate the ion product for the potential precipitate. The Ksp of Ni(OH)2(s) is 6.0x10^-16Saturday, May 14, 2016 by Brianne

Chemistry
Consider the following system at equilibrium. CaCO3(s) mc032-1.jpg Ca2+(aq) + CO32(aq) The addition of which compound will cause a shift in equilibrium because of a common ion effect? CCl4 CO2 CuSO4 Na2CO3Saturday, May 14, 2016 by Haylie S

Chemistry
The diagram shows an electrochemical cell with a gold strip (left) and aluminum glasses (right). In your response, do the following:  Label the cathode and the anode, including the charge on each.  Show the flow of electrons.  Describe what type of ...Friday, May 13, 2016 by kat

Chemistry
3. The diagram shows an electrochemical cell with a gold strip (left) and aluminum glasses (right). In your response, do the following:  Label the cathode and the anode, including the charge on each.  Show the flow of electrons.  Describe what type of ...Friday, May 13, 2016 by kat

chemistry
You have 95.0 mL of a 2.50 M solution of Na2CrO4(aq). You also have 125 mL of a 2.50 M solution of AgNO3(aq). Calculate the concentration of Na+ after the two solutions are mixed together. 1.08 M 0.475 M 5.00 M 0.00 M 2.16 MFriday, May 13, 2016 by Ha

Chemistry
If The Rate of Diffusion Of Oxygen Is Taken As The Rate Of 1. What Will Be The Rate Of Diffusion Of Methane Whose Relative Molecular Mass Is 16Friday, May 13, 2016 by Rashidat

Chemistry
45.1 grams of Sodium Chloride is combined with 72.3 grams of barium phosphate. Balance the following equation NaCl + Ba3(PO4)2 --> Na3PO4 + BaCl2 How many grams of Barium dichloride will be produced?Thursday, May 12, 2016 by Adam / DrBob222

chemistry
1. A large salt crystal having a volume of 56 cm3 and a density of 2.17 g/cm3 was dissolved in to sufficient water to make 375 mL of solution. What is the salt concentration in the solution as g/L?Thursday, May 12, 2016 by Montie Stengel

Chemistry
Activation energy is____ the heat released in a reaction*** the energy barrier between reactants and products the energy given off when reactants collide generally very high for a reaction that takes place rapidlyThursday, May 12, 2016 by Annamarie

chemistry
A large salt crystal having a volume of 56 cm3 and a density of 2.17 g/cm3 was dissolved in to sufficient water to make 375 mL of solution. What is the salt concentration in the solution as g/L?Thursday, May 12, 2016 by chrissy

Chemistry
A naturally occuring sample of copper consists of 69.2% of Cu63 and 30.8% of Cu65.The relative atomic mass of Cu63 is 62.93 and that of Cu65 is 64.93.Find the atomic mass of a naturally occuring sample of copper.Thursday, May 12, 2016 by Bhagavatula yogiraj

chemistry
Calculate the temperature in kelvin of a 2.5 mol sample at 8.3 atm in 45 L. Give your answer to 2 sig figs. Which equation do I use to calculate temperature?Thursday, May 12, 2016 by Kierstin

Chemistry
Calculate the pH of a buffered solution prepared from 0.25 mol KF and 0.75 HF after the addition of 0.05 mol of NaOH (assume a 1.0 L volume of solution) I get that i need to use two seperate ice tables, but i don't really understand how to go about doing that?Thursday, May 12, 2016 by Megan

Chemistry
How do can you find the difference between these acids/bases with only one indicator? We have 0.1M NaOH, H2SO4, HCl, AlCl3, and Na2CO3. We know the pH of all the solutions (AlCl3 = 2.9, H2SO4 = 0.7, HCl = 1, Na2CO3 = 11.8, NaOH = 13). We only can use 1 indicator to determine ...Wednesday, May 11, 2016 by Jaime

Chemistry
The human body is said to contain approximately 50.0 grams of DNA in the entire body. If the number of nucleotides in one strand of DNA is approximately 3.0 x 10^6, and the average molar mass of a nucleotide is 327 g/mole, what is the average molar mass of an entire DNA double...Wednesday, May 11, 2016 by Merp

Chemistry
5.88 moles of nitrogen and 16.2 moles of oxygen are mixed until the equilibrium is established, 11.28 moles of nitric oxide are formed calculate the value of equilibrium constantWednesday, May 11, 2016 by Anon

Chemistry
The human body is said to contain approximately 50.0 grams of DNA in the entire body. If the number of nucleotides in ONE STRAND of DNA is approximately 3.0 x 106, and the average molar mass of a nucleotide is 327 g/mol, what is the average molar mass of an entire DNA double ...Wednesday, May 11, 2016 by KS

Chemistry
I'm sorry here is another I do not understand. How do you find out exactly how much of a solution you would need to completely precipitate another compound in the reaction? We can precipitate out solid lead(II) iodide from an aqueous lead(II) nitrate solution by adding ...Tuesday, May 10, 2016 by Kierstin

Chemistry
20. What is the molecular formula for alkane, alkenes and alkynes? 15.What happens to a reaction at equilibrium when more reactant is added to the system?Tuesday, May 10, 2016 by BLAH

Chemistry
We can precipitate out solid lead(II) iodide from an aqueous lead(II) nitrate solution by adding potassium iodide. If we have 500. mL of 0.632 M lead(II) nitrate solution and add excess potassium iodide, how much solid lead(II) iodide will form (in grams)? 2 KI(aq) + Pb(NO3)2(...Tuesday, May 10, 2016 by Kierstin

chemistry
The total mass of DNA in the body is 50.0 g. If the number of nucleotides in ONE STRAND of DNA is approximately 3.0 x 106, and the average length of a single nucleotide is 0.34 nm, what is the length (in km) of one strand of DNA when it is stretched out to its maximum length (...Tuesday, May 10, 2016 by jenna

chemistry
The human body is said to contain approximately 50.0 grams of DNA in the entire body. If the number of nucleotides in ONE STRAND of DNA is approximately 3.0 x 106, and the average molar mass of a nucleotide is 327 g/mol, what is the average molar mass of an entire DNA double ...Tuesday, May 10, 2016 by jenna

Chemistry
When I push on my refrigerator, there is a force acting on it that wasn't there before. That means it should be experiencing an unbalanced force and begin to move. Why doesn't it?Tuesday, May 10, 2016 by Jaz

Chemistry
A buffer system contains 0.30 M NH4+ and 0.15 M NH3. pKa of NH4+ is 9.25. How many moles of NaOH must be added to 1.00 L of this solution to increase the pH to 9.25? Hint: What is the (NH3) / (NH4+) when the pH=pKa?Tuesday, May 10, 2016 by Ally

chemistry
Henry's law constant for N2 and O2 is 1.6 *10^-6and 8.77*10^-7 molal/mm Hg at 298k.Air has 78 mole percentage N2 and 21 mole percentage O2.at atmospheric pressure the ratio of solubility of N2 and O2 in water is?Tuesday, May 10, 2016 by Rahul

Chemistry
The nitric acid was purchased as a solution that has 70% HNO3. That volume (mL) of this solution is necessary for preparing 250 mL Solution 2.0 mol L-1? The density of HNO3 (aq) 70% is 1.42 g cm-3Tuesday, May 10, 2016 by Adam

Chemistry
You want to neutralize 6 mol of sulfuric acid with 6.0 M sodium hydroxide. How much 6.0 M sodium hydroxide must you add to react exactly with the sulfuric acid? 2NaOH(aq)+H2SO4(aq)-->2H2O(l)+Na2SO4(​aq) 2 moles sodium hydroxide for every 1 mol sulfuric acid. which ...Monday, May 9, 2016 by Kierstin

chemistry
how many unpaired electrons are in this complex? Ni(en)2(CN)2 where en is the neutral ethylenediamine and CN is cyanide as the counter ion, I want to say there are no unpaired e- but I'd like a checkMonday, May 9, 2016 by Anonymous

Chemistry
Sulfamethoxazole has the molecular formula C10H11N3O3S. 10.0 g of tablets containing sulfamethoxazole and trimethoprim were crushed and dissolved in water. A strong oxidising agent was added, which converted all the sulfur in the sulfamethoxazole into sulfate ions. Following ...Sunday, May 8, 2016 by M

Chemistry- Dr.Bob222
What is the solubility of AgCl in 10 M NH3? The Kf of Ag(NH3)2+ from AgCl(s) in aqueous NH3 is 0.0031, which is for the balanced reaction shown below. AgCl(s) + 2 NH3(aq) → Ag(NH3)2+(aq) + Cl-(aq) Work: Ksp = x^2 /(2x+10)^2 = 1.8 x 10^-10 Now I am confused....... At ...Sunday, May 8, 2016 by Nevaeh

Chemistry- Dr.Bob222
I do not quiet understand what you said. Could you show your work. What is the solubility of AgCl in 10 M NH3? The Kf of Ag(NH3)2+ from AgCl(s) in aqueous NH3 is 0.0031, which is for the balanced reaction shown below. AgCl(s) + 2 NH3(aq) → Ag(NH3)2+(aq) + Cl-(aq)Saturday, May 7, 2016 by Nevaeh

Chemistry- Dr.Bob222
Question 2 What is the solubility of AgCl in 10 M NH3? The Kf of Ag(NH3)2+ from AgCl(s) in aqueous NH3 is 0.0031, which is for the balanced reaction shown below. AgCl(s) + 2 NH3(aq) → Ag(NH3)2+(aq) + Cl-(aq) Is the answer 0.557 M?Saturday, May 7, 2016 by Nevaeh

Chemistry
You want to neutralize 6 mol of sulfuric acid with 6.0 M sodium hydroxide. How much 6.0 M sodium hydroxide must you add to react exactly with the sulfuric acid? 2NaOH(aq)+H2SO4(aq)-->2H2O(l)+Na2SO4(​aq) 2 moles sodium hydroxide for every 1 mol sulfuric acid. I do not...Saturday, May 7, 2016 by Kierstin

chemistry
A 15.0 g sample consisting of a mixture of silver nitrate and sodium nitrate is dissolved in water. This aqueous mixture then reacts with aqueous potassium chloride to form 3.97 g of solid. Calculate the percent by mass of silver nitrate in the first mixture.Saturday, May 7, 2016 by Chuck

Chemistry
How do you transform an alcohol into an alkene? The example I need help with is: What are the reagents to transform 1,2-dimethyl-propanol to 4,5-dimethyl-2-hexene? This must be done in two steps.Saturday, May 7, 2016 by Alice

Chemistry
What volume of oxygen gas is needed for the complete combustion of 4.00 L of ethane gas, C2H6? Assume that the temperature and pressure of the reactants are the same.Saturday, May 7, 2016 by Lauren

Chemistry
How would one work through this problem? -Calculate the number of liters of 1.25M solution that can be made from 6.400g of barium nitrate. - I know that it's just stoichiometry, but I'm confused. The formula for molarity is the number of moles of the solute divided by ...Saturday, May 7, 2016 by Charlie

Chemistry
At 25 °C, an aqueous solution has an equilibrium concentration of 0.00147 M for a generic cation, A (aq), and 0.000735 M for a generic anion, B2(aq). What is the equilibrium constant, Ksp, of the generic salt A2B(s)?Friday, May 6, 2016 by Jordan